Something I like to do when emailing from web applications is to have a configurable BCC property.
When set (to a specific email address) it means all outgoing emails will get bcc'd to you (blind carbon copy - so recipient cant see you).
This can be quite useful when first testing the app.
Would just need another setting e.g. Email.BCCEmailAddress and to modify SendEmail() in message manager to check to see if a bcc address exists. If so, then bcc the email.
Cheers,
Ben